CVE-2026-59152

The LangSmith Client SDKs’ TracingMiddleware had a vulnerability before version 0.8.18 where an HTTP request to a server running TracingMiddleware could trigger reading an arbitrary file from the server’s filesystem and uploading it to LangSmith as a trace attachment. This enables a trust-boundar...

GHSA-F4XH-W4CJ-QXQ8 LangSmith SDK TracingMiddleware: Arbitrary server-side file read

Summary An attacker who can send an HTTP request to a server running the LangSmith SDK's TracingMiddleware can cause that server to read an arbitrary file from its local filesystem and upload the contents to LangSmith as a trace attachment. Depending on how the distributed trace system is deploye...